Applications Included in CCleaner that don't exist on my PC

Currently CCleaner applications include some that to the best of my knowledge are not on my Windows XP Pro computer. These include: Ditto, McAfee Antivirus and Windows Game Explorer.

Why are these applications listed? A scan of my HDD and regedit doesn't reveal any listing of these two applications.

How did CCleaner decide to include these applications?

If you can't find them in the registry look elsewhere, since CCleaner can detect registry and files:

* C:\Program Files

* C:\Documents and Settings\All Users\Application Data

* C:\Documents and Settings\Your User Name\Application Data
* C:\Documents and Settings\Your User Name\Local Settings\Application Data